Electrical Connections - Ecoflam Multicalor 170.1 Manual

Gas/light-oil dual burners

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Manual (41 pages)

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All burners are factory tested and set at 400 V 50 Hz three-phase for motors and 230 V 50 Hz monophase with neutral

for auxiliaries. If it is necessary to supply the burner at 230 V 50 Hz without neutral,make the necessary alterations

referring to the wiring diagram of the burner and check that the termal relay is within the absorption range of the

motor. Also check that the fan motor rotates in the correct direction.

Once connected the burner to the gas pipeline, it is necessary to control that this last is perfectly sealed. Also verify that

the chimney is not obstructed. Open the gas cock and carefully bleed the piping through the pressure gauge connector,

then check the pressure value trough a suitable gauge. Power on the system and adjust the thermostats to the desired

temperature. When thermostats close, the sealing control device runs a seal test of valves; at the end of the test the bur-

ner will be enabled to run the start-up sequence.

Before starting the burner, make sure it is mounted correctly. Then check connections are correct according to the dia-

gram and piping is appropriate to the system. Before connecting the burner to the electricity supply, make sure voltage

corresponds to burner plate data. The connection diagram and start-up cycle are shown separately. For wiring from

control box to burner, see the enclosed connection diagram. Pay particular attention to neutral and phase connections :

never exchange them!. Vent air and impurities of gas pipe. Check gas pressure conforms to the limits stated on the bur-

ner plate when connecting a master gauge to the test port provided on the burner. Blower

motor starts and pre-purging begins. Since pre-purging has to be carried out with the max. air

delivery, the burner control circuit turns the air damper to the max. delivery position by the air

servocontrol in approximately 30 seconds time. When the servocontrol is fully open, a signal to

the electronic control unit starts the 66 seconds pre-purge cycle. At the end of the prepurging

time, the air servocontrol gets to the Low Flame position so that burner ignition is ensured at

min. output. Simultaneously the ignition transformer receives voltage and after 3 seconds (pre-

ignition) opens the gas valve. Fuel flows to the combustion head and ignites, being governed by the gas firing butterfly

valve. Two seconds after gas valves have opened, the ignition transformer is excluded from the circuit. In case of no

ignition the burner goes to lock-out within two seconds. Now the burner is operating at the min. firing rate (about

30% of the max. firing rate). The air servocontrol runs at the Low Flame position and in case the temperature control

has to be set at the max. output it goes to a fully open position of air damper and butterfly valve. During the burner-off

periods the air dumper closes up fully.

IMPORTANT: to obtain the right adjustment of the combustion and thermal capacity it is important to analyze the

reducts of combustion with the aid of suitable instruments. The combustion and thermal capacity adjustment is done

simultaneously, together with the analysis of the products of combustion, making sure that the measured values are sui-

table and that they comply with current safety standards. On this matter, please refer to the table and figure below.

THESE OPERATIONS MUST BE DONE BY PROFESSIONALLY-QUALIFIED TECHNICIANS.

NOTE:

ALL SAFETY DEVICES (AIR PRESSURE SWITCH, MINIMUM GAS PRESSURE SWITCH, GAS SOLENOID

VALVES AND GAS GOVERNOR) SHALL BE DULY SEALED AFTER CALIBRATION AND BURNER START

UP BY ECOFLAM'S TECHNICIANS.

Natural Gas

9,6%

CO <100 ppm